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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let a1 = String.fromCharCode(0x00C5),
        a2 = String.fromCharCode(0x212B),
        a3 = String.fromCharCode(0x0041, 0x030A);
    
    console.log(a1 === a1.normalize("NFD"));  // false
    console.log(a1 === a1.normalize("NFC"));  // true
    console.log(a1 === a1.normalize("NFKD"));  // false
    console.log(a1 === a1.normalize("NFKC"));  // true

    console.log(a2 === a2.normalize("NFD"));  // false
    console.log(a2 === a2.normalize("NFC"));  // false
    console.log(a2 === a2.normalize("NFKD"));  // false
    console.log(a2 === a2.normalize("NFKC"));  // false

    console.log(a3 === a3.normalize("NFD"));  // true
    console.log(a3 === a3.normalize("NFC"));  // false
    console.log(a3 === a3.normalize("NFKD"));  // true
    console.log(a3 === a3.normalize("NFKC"));  // false
  </script>
</body>
</html>